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Updated: Jun 3, 2025

Establishing a Competing Risk Regression Nomogram Model for Survival Data
Published on: October 23, 2020
Comparison of survival between unilateral and bilateral breast cancers using propensity score matching: a
Talar Ozler1, Rusen Cosar2, Necdet Sut3
1Department of Radiation Oncology, Faculty of Medicine, Trakya University, Edirne, Turkey.
Purpose:
The characteristics of patients with bilateral and unilateral breast cancer at the time of diagnosis or during follow-up have been compared, focusing on the differences in disease-free survival and overall survival between these groups.
Methods:
A total of 1,947 patients diagnosed with invasive carcinoma were included in the study. 1876 (96.4%) of our patients had unilateral and 71 (3.6%) had bilateral breast cancer. Among the bilateral breast cancer patients n = 47 were metachronous, while n = 24 were synchronous.
Results:
SBBC, which had the lowest OS duration, showed a statistically significant difference compared to MBCC, similar to that observed in unilateral breast cancer (p = 0.027).
Conclusion:
The fact that SBBC has the lowest survival rate despite more aggressive treatments should be considered a poor prognostic factor for survival on its own.
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